Wrong or outdated parameters of the configure scripts

huligan · 11-15-2017, 05:27 AM

Hi,

I've noticed some of the configure scripts parameters that I should use according to the LFS systemd book are not supported by those configure scripts or I don't understand something. For example according to chapter 5.4.1 of the LFS systemd book I should use --with-sysroot=$LFS parameter to build binutils 2.29. However if I read the configure script of binutils 2.29 there is no such a parameter. But there is --with-build-sysroot

Code:

  --with-build-sysroot=SYSROOT
                          use sysroot as the system root during the build

Was the --with-sysroot parameter changed to --with-build-sysroot or it's still supported by some other script the configure script includes?

Same issue with --with-sysroot parameter in chapter 5.5.1 of the book where gcc 7.2.0 is compiled. It also instructs to use --with-local-prefix that I also can't find in the configure script of gcc 7.2.0

There could be other configure parameters mentioned in the book but not found in the configure scripts themselves.

Could someone explain all this mystic? Thanks.

business_kid · 11-15-2017, 02:13 PM

The builds are checked against the book. You have to use the paths they specify, but the lfs book should should build the exact programs specified. If it doesn't, report a bug in the book.

If you're building LFS, however you obviously love learning, or suffering :-P. Often both go toghether. There's a little suffering in that for you if something is buggy/broken. But it might be something like 2.1.24-P4 versus 2.1.24-P5 in the version number.

huligan · 11-15-2017, 03:37 PM

I just want to understand what I'm running. The --with-sysroot seems as it doesn't exist and being just ignored by the configure script. If this is not true, please explain how does it work.

business_kid · 11-16-2017, 03:33 AM

If you want to understand what you're running look at the output of

Code:

./configure --help |less

--with-build-sysroot is at first slightly ambiguous; But there's also --prefix, which sets install root. For something like glibc, which has to drop files in /lib(64) --prefix has to be your new system's root. That helps. Now we can guess

--with-build-sysroot= root of tree from where you pick up the libs and includes neccessary for compilation
--prefix = --with-install-sysroot = install destination.

So in ch. 5, the build sysroot would be the base system, and in chapter 6 it would be the chapter 5 system. Do the provided details back that up?

huligan · 11-16-2017, 04:12 AM

Quote:

Originally Posted by business_kid

If you want to understand what you're running look at the output of

Code:

./configure --help |less

--with-build-sysroot is at first slightly ambiguous; But there's also --prefix, which sets install root. For something like glibc, which has to drop files in /lib(64) --prefix has to be your new system's root. That helps. Now we can guess

--with-build-sysroot= root of tree from where you pick up the libs and includes neccessary for compilation
--prefix = --with-install-sysroot = install destination.

So in ch. 5, the build sysroot would be the base system, and in chapter 6 it would be the chapter 5 system. Do the provided details back that up?

My question was not about '--with-build-sysroot' (that also isn't mentioned in the 5.x chapters of LFS) but about '--with-sysroot' (mentioned in the LFS book). I had read the out put of './configure --help' and also read the source code of the ./configure script itself but was unable to find anything related to the '--with-sysroot' (without -build-) parameter. I know what '--with-build-sysroot' does (adds --sysroot=<path> to the gcc flags). But what '--with-sysroot' does and where it's implemented?